Houdongkeng Waterfall (中文版: 猴洞坑瀑布) is a small, but nice, two tier waterfall in Yilan, Toucheng County. It's only a 5 minute walk from the road, and the first tier is deep enough for swimming.
It's right next to the entrance for the Paoma trail (跑馬古道).
Yilan County,，Toucheng Township
Waterfall: 24.84318, 121.7824
Parking: 24.84152, 121.78256
Detailed Map: https://goo.gl/G462DY